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SEABROOK STATION RELIEF VALVE PROGRAM Roger Samson Bob Thomas Plant Engineering Maintenance PRDUG MEETING, ORLANDO, FLA. JANUARY 24-26, 2001.

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Presentation on theme: "SEABROOK STATION RELIEF VALVE PROGRAM Roger Samson Bob Thomas Plant Engineering Maintenance PRDUG MEETING, ORLANDO, FLA. JANUARY 24-26, 2001."— Presentation transcript:

1 SEABROOK STATION RELIEF VALVE PROGRAM Roger Samson Bob Thomas Plant Engineering Maintenance PRDUG MEETING, ORLANDO, FLA. JANUARY 24-26, 2001

2 Seabrook Relief Valve Team2 SEABROOK STATION RELIEF VALVE PROGRAM Testing VideoR. Samson / R. Thomas Program overviewR. Samson ORO-7 Code RevisionR. Samson Determination of testing parametersR. Samson Test Equipment / Facility developmentR. Thomas Data Package Revision For Hot TestingR. Thomas ORO-7 testing resultsR. Thomas / R. Samson EPRI Test ModelR. Samson / R. Thomas Questions and AnswersR. Samson / R. Thomas

3 Seabrook Relief Valve Team3 Program Overview Last plant using ASME XI, 1983 Edition, Summer Addenda No thermal relief valves TWO PARAGRAPHS - PTC 25.3 Bench test at ambient temperature First plant using ASME O&M Code 1995 Edition, 1996 Addenda in its entirety Thermal relief valves now included Significant changes - prescriptive test requirements (Test media and ambient air temp requirements)

4 Seabrook Relief Valve Team4 SEABROOK STATION RELIEF VALVE PROGRAM Program overviewR. Samson ORO-7 Code RevisionR. Samson Determination of testing parametersR. Samson Test Equipment / Facility developmentR. Thomas Data Package Revision For Hot TestingR. Thomas ORO-7 testing resultsR. Thomas / R. Samson EPRI Test ModelR. Samson / R. Thomas Questions and AnswersR. Samson / R. Thomas

5 Seabrook Relief Valve Team5 OR07 Code Revision New prescriptive test requirements: Class 1 RV’s and MSSV’s – 5 years, 20% min. in 2 yrs. Class 2&3 RV’s – 10 years, 20% min. in 4 yrs..Additional scope if failure occur.Replacement Valves – special testing requirements..Rupture Disks – replace every 5 years. Instrumentation ‑  1% of setpoint.

6 Seabrook Relief Valve Team6 OR07 Code Revision New prescriptive test requirements (con’t) Testing Sequence:Visual, Leak, Setpoint, Leak, Bellows Test Media same as operating, (e.g., steam, air, N 2, water, oil, etc.). Test Media Temperature & Ambient Temperature Operating vs. conditions when valve is expected to actuate Thermal Equilibrium Criteria, (  10  F change in 30 minutes) 10 Minutes between Lift Tests 2 Consecutive Lifts, (without adjustment) Alternate Test Media Correlation.

7 Seabrook Relief Valve Team7 Significant Changes Test Media Temperature & Ambient Temperature - Expected to perform its intended function These conditions also apply to Seat Tightness. Requires test equipment with “Hot” testing capabilities.

8 Seabrook Relief Valve Team8 Significant Changes (con’t) Alternate Test Media Correlation Permits testing using both cold ambient and media conditions provided that correlation test data exists to support cold testing. Some vendors had media correlation No vendors combined media and ambient temperature No vendors had ambient temperature correlation Some vendors refused to do alternate media testing

9 Seabrook Relief Valve Team9 SEABROOK STATION RELIEF VALVE PROGRAM Program overviewR. Samson ORO-7 Code RevisionR. Samson Determination of testing parametersR. Samson Test Equipment / Facility developmentR. Thomas Data Package Revision For Hot TestingR. Thomas ORO-7 testing resultsR. Thomas / R. Samson EPRI Test ModelR. Samson / R. Thomas Questions and AnswersR. Samson / R. Thomas

10 Seabrook Relief Valve Team10 Determination of testing parameters Temperature Requirements - two methods: Normal system operating Versus Conditions when valve is expected to perform its function upset system or emergency accident condition what function each valve was performing what conditions were associated with its function Document search included Technical Specifications, UFSAR, System Calculations and technical (T/P) sheets

11 Seabrook Relief Valve Team11 Test valve

12 Seabrook Relief Valve Team12 SEABROOK STATION RELIEF VALVE PROGRAM Program overviewR. Samson ORO-7 Code RevisionR. Samson Determination of testing parametersR. Samson Test Equipment / Facility developmentR. Thomas Data Package Revision For Hot TestingR. Thomas ORO-7 testing resultsR. Thomas / R. Samson EPRI Test ModelR. Samson / R. Thomas Questions and AnswersR. Samson / R. Thomas

13 Seabrook Relief Valve Team13 Test Equipment / Facility Development

14 Seabrook Relief Valve Team14 Test Equipment / Facility development Design Considerations SAFETY VOLUME CONTROL TEMPERATURE CONTROL ERGONOMIC OPERATOR CONTROLS

15 Seabrook Relief Valve Team15 SAFETY Due to the increased energy potential created by flashing fluids, special safety features were included in the equipment and facilities design.

16 Seabrook Relief Valve Team16 SAFETY RCA TEST STAND Due to radiological release concerns, the RCA test stand discharge system includes an adjustable, sealed discharge pipe for each table and a vented discharge tank. The tank is equipped with a sparging system and has provisions for connection of a HEPA filter, if required. COLD SIDE TEST STAND The cold side test stand discharge system includes an adjustable, sealed discharge pipe and an exhaust pipe vented to atmosphere through the side of the building.

17 Seabrook Relief Valve Team17 SAFETY Quick Acting Valves Quick acting air operated valves were added on the accumulator and table vent lines This allows for rapid venting if the pressure increases in the test stand due to internal flashing. Quick acting air operated valves were also added on the accumulator / table isolation valves in case of a stuck open valve.

18 Seabrook Relief Valve Team18 Test Equipment / Facility development Design Considerations SAFETY VOLUME CONTROL TEMPERATURE CONTROL ERGONOMIC OPERATOR CONTROLS

19 Seabrook Relief Valve Team19 VOLUME CONTROL Manual bypass valve on water side Three rates of air feeds to the accumulator Bypass line on the water circuit allows for low volume set pressure testing on smaller valves or when lifting larger valves is undesirable. Three rates of air feed to accumulator lets the operator vary the fill rate and air volume from air storage to accumulator.

20 Seabrook Relief Valve Team20 VOLUME CONTROL Restricting Devices Valves are often partially gagged to restrict lift and conserve heated water.

21 Seabrook Relief Valve Team21 Test Equipment / Facility development Design Considerations SAFETY VOLUME CONTROL TEMPERATURE CONTROL ERGONOMIC OPERATOR CONTROLS

22 Seabrook Relief Valve Team22 TEMPERATURE CONTROL Local Controllers Each heat zone has a local controller to program final temperature settings, and ramp rates Separate Heat Zones Vessel, piping, and environmental chambers are divided into seperate heating zones for variable heat control.

23 Seabrook Relief Valve Team23 Test Equipment / Facility development Design Considerations SAFETY VOLUME CONTROL TEMPERATURE CONTROL ERGONOMIC OPERATOR CONTROLS

24 Seabrook Relief Valve Team24 ERGONOMIC OPERATOR CONTROLS

25 Seabrook Relief Valve Team25 Cold Side Test Stand Control Panel Because of the extended testing duration's, sit down control panels were used on both hot and cold side testers. All controls are within easy reach of operator. Valves, pressure gauges, switches and heating controllers are all accurately positioned on the tester’s schematic “mimic”. ERGONOMIC OPERATOR CONTROLS

26 Seabrook Relief Valve Team26 ERGONOMIC OPERATOR CONTROLS

27 Seabrook Relief Valve Team27 ERGONOMIC OPERATOR CONTROLS

28 Seabrook Relief Valve Team28 ERGONOMIC OPERATOR CONTROLS

29 Seabrook Relief Valve Team29 SEABROOK STATION RELIEF VALVE PROGRAM Program overviewR. Samson ORO-7 Code RevisionR. Samson Determination of testing parametersR. Samson Test Equipment / Facility developmentR. Thomas Data Package Revision For Hot TestingR. Thomas ORO-7 testing resultsR. Thomas / R. Samson EPRI Test ModelR. Samson / R. Thomas Questions and AnswersR. Samson / R. Thomas

30 Seabrook Relief Valve Team30 Data Package Revision For Hot Testing

31 Seabrook Relief Valve Team31 SETPOINT VERIFICATION / DATA ACQUISITION SETPOINT VERIFICATION

32 Seabrook Relief Valve Team32 SETPOINT VERIFICATION / DATA ACQUISITION SETPOINT VERIFICATION

33 Seabrook Relief Valve Team33 SETPOINT VERIFICATION / DATA ACQUISITION SETPOINT VERIFICATION

34 Seabrook Relief Valve Team34 SETPOINT VERIFICATION / DATA ACQUISITION Cold SideTester PipingHot Side Tester Piping

35 Seabrook Relief Valve Team35 SETPOINT VERIFICATION / DATA ACQUISITION

36 Seabrook Relief Valve Team36 SETPOINT VERIFICATION / DATA ACQUISITION

37 Seabrook Relief Valve Team37 SETPOINT VERIFICATION / DATA ACQUISITION

38 Seabrook Relief Valve Team38 SETPOINT VERIFICATION / DATA ACQUISITION

39 Seabrook Relief Valve Team39 SETPOINT VERIFICATION / DATA ACQUISITION

40 Seabrook Relief Valve Team40 SEABROOK STATION RELIEF VALVE PROGRAM Program overviewR. Samson ORO-7 Code RevisionR. Samson Determination of testing parametersR. Samson Test Equipment / Facility developmentR. Thomas Data Package Revision For Hot TestingR. Thomas ORO-7 testing resultsR. Thomas / R. Samson EPRI Test ModelR. Samson / R. Thomas Questions and AnswersR. Samson / R. Thomas

41 Seabrook Relief Valve Team41 OR07 Test Results New Scope thermal relief valves - near 100% One LER - RH Suction Relief Valve lifted low Expanded scope for several groups Containment Component Cooling system 2 Rupture Disc replaced Oil tests - DG System

42 Seabrook Relief Valve Team42 OR07 Test Results

43 Seabrook Relief Valve Team43 OR07 Test Results

44 Seabrook Relief Valve Team44 OR07 Test Results

45 Seabrook Relief Valve Team45 SEABROOK STATION RELIEF VALVE PROGRAM Program overviewR. Samson ORO-7 Code RevisionR. Samson Determination of testing parametersR. Samson Test Equipment / Facility developmentR. Thomas Data Package Revision For Hot TestingR. Thomas ORO-7 testing resultsR. Thomas / R. Samson EPRI Test ModelR. Samson / R. Thomas Questions and AnswersR. Samson / R. Thomas

46 Seabrook Relief Valve Team46 EPRI Test Model The plan involved 60 lifts, 10 at each set of ambient and fluid temperatures. The first three tests will evaluate fluid temperature effects alone. The next two (when combined with the first) will evaluate the effects of ambient temperature alone. The final test when compared to the first will evaluate the combined effects of fluid and ambient temperature increases. By conducting 10 lifts at each test condition we will obtain excellent statistical confidence in the observed mean values from each data set. EPRI will begin the development of the thermal model with the intention of predicting the set point changes resulting from the testing described above. Based on the results of this effort, EPRI will be able to develop a cost effective research plan for validating the model for the full range of class 2 and 3 relief valve designs in use in the industry. In addition, the data obtained will provide very significant insights into the effects of fluid and ambient temperatures on relief valve set points. Shortly after our facility was declared operational EPRI was invited for a facility tour and demonstration. After the visit EPRI requested that Seabrook run a series of tests at various combinations of fluid and ambient temperatures. Seabrook agreed to perform the testing which was completed in late November.

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